<template>
   <div class="todo-footer">
        <label>
          <!-- 点击事件方式 -->
          <input type="checkbox" :checked="allCheck" @click="handleCheckAll"/>
        </label>
        <span>
          <span>已完成{{doneCount}}</span> / 全部{{total}}
        </span>
        <button class="btn btn-danger" @click="deleteAllDone">清除已完成任务</button>
      </div>
</template>

<script>
  export default {
    name:'Footer',
   props:['deleteAllDone','todos','checkAll'],
   computed: {
     doneCount(){
        return this.todos.filter(todo => todo.done === true).length
     },
     total(){
        return this.todos.length
    },
    allCheck(){
       return this.doneCount === this.total && this.total > 0
    }
   },
   methods:{
     handleCheckAll(event){
       this.checkAll(event.target.checked);
     }
   }
  }
</script>

<style scoped>
  /*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>